Fix Actor Collision Checks Again

* Recent collision update caused a regression where the player would get
  "stuck" while standing on top of a solid doodad, unable to walk left
  or right.
* When deciding if the actor is on top of a doodad, use the doodad's
  Hitbox (if available) instead of the bounding box. This fixes the
  upside-down trapdoor acting solid when landed on from the top, since
  its Hitbox Y coordinate is not the same as the top of its sprite.
* Cheats: when using the noclip cheat in Play Mode, you can hold down
  the Shift key while moving to only move one pixel at a time.

dev-assets/doodads/crumbly-floor/crumbly-floor.js

@@ -19,10 +19,6 @@ function main() {
 	var startedAnimation = false;
 
 	Events.OnCollide(function(e) {
-		// Only trigger for mobile characters.
-		if (!e.Actor.IsMobile()) {
-			return;
-		}
 
 		// If the floor is falling, the player passes right thru.
 		if (state === stateFalling || state === stateFallen) {
@@ -36,6 +32,11 @@ function main() {
 				return false;
 			}
 
+			// If movement is not settled, be solid.
+			if (!e.Settled) {
+				return false;
+			}
+
 			// Begin the animation sequence if we're in the solid state.
 			if (state === stateSolid) {
 				state = stateShaking;